Table 1.

Indexes of structural diversity (Shannon-Wiener), specificity (phylo-structural index), and link intensity on resource (PDI), of two acanthocephalan parasites of fish, Pomphorhynchus laevis and P. tereticollis, and level of niche overlap between the two parasites. Parameters of host use (species range and mean abundance per host species) were estimated from a large sample of fish representative of local fish community, in two rivers where the two parasite species occur in sympatry (Ouche and Vingeanne rivers).

	Shannon index of diversity		Phylo-structural index		Paired Difference Index		Niche overlap between P. laevis and P. tereticollis
	P. laevis	P. tereticollis	P. laevis	P. tereticollis	P. laevis	P. tereticollis	Renkonen’ index (Log flow rate)
Ouche	2.85	1.77	0.69:	0.74	0.71	0.94	0.33
Vingeanne	0.44	1.6	0.82	0.61	0.96	0.92	0.21

Significant values are indicated in bold.